# The genome sequence of True’s beaked whale, Mesoplodon mirus True, 1913 (Artiodactyla: Ziphiidae)

## TL;DR

This paper presents the genome sequence of True’s beaked whale, including two haplotypes and mitochondrial DNA, as part of a larger project to sequence species in Britain and Ireland.

## Contribution

The paper provides the first reference genome for Mesoplodon mirus, including detailed haplotype and mitochondrial assemblies.

## Key findings

- The genome assembly includes two haplotypes with lengths of 3,442.40 and 2,956.53 megabases.
- Haplotype 1 is largely scaffolded into 21 chromosomal pseudomolecules, including the X chromosome.
- Gene annotation identified 18,422 protein-coding genes in the assembly.

## Abstract

We present a genome assembly from an individual female
Mesoplodon mirus (True’s beaked whale; Chordata; Mammalia; Artiodactyla; Ziphiidae). The assembly contains two haplotypes with total lengths of 3 442.40 megabases and 2 956.53 megabases. Most of haplotype 1 (79.62%) is scaffolded into 21 chromosomal pseudomolecules, including the X sex chromosome. Haplotype 2 was assembled to scaffold level. The mitochondrial genome has also been assembled, with a length of 16.35 kilobases. Gene annotation of this assembly on Ensembl identified 18 422 protein-coding genes. This assembly was generated as part of the Darwin Tree of Life project, which produces reference genomes for eukaryotic species found in Britain and Ireland.